The Synchro,control Transformer, cataloged under National Stock Number 5990-00-644-0129, is classified within Federal Supply Class 5990 (Synchros and Resolvers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 29 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5990-00-644-0129 |
| Primary Part Number | SK91499 |
| Item Name | Synchro,control Transformer |
| FSC / FSG | 5990 / 59 — Synchros and Resolvers |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Body Size | 34 |
| Shaft Type | ROUND, SLOTTED SINGLE SHAFT |
| Body Diameter | 2.8100 INCHES NOMINAL IN |
| Flange Diameter | 3.5000 INCHES NOMINAL IN |
| Second Shoulder Face to Rear Flange Distance | 4.2840 INCHES NOMINAL IN |
| Shaft Diameter | 0.2480 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM SINGLE SHAFT IN |
| Rotor DC Resistance in Ohms | 200.00 NOMINAL |
| Length | 0.3280 INCHES NOMINAL SHOULDER IN |
| Body Style | STANDARD ROUND, REAR MOUNTING FLANGE |
| Flange Thickness | 0.3440 INCHES NOMINAL IN |
| Stator Input Current Rating | 35.0 MILLIAMPERES NOMINAL |
| Shaft Thread Length | 0.1800 INCHES NOMINAL SINGLE SHAFT IN |
| Frequency in Hertz | 400.0 NOMINAL |
| Stator Input Electrical Power Rating | 700.0 MILLIWATTS NOMINAL |
| Terminal Location | REAR |
| Shaft Length | 1.3000 INCHES NOMINAL SINGLE SHAFT IN |
| Pilot Diameter | 0.9840 INCHES MINIMUM AND 0.9842 INCHES MAXIMUM IN |
| Second Shoulder Length | 0.0220 INCHES NOMINAL IN |
| Shoulder Diameter | 1.7710 INCHES MINIMUM AND 1.7715 INCHES MAXIMUM IN |
| Shaft Nominal Thread Size | 0.250 INCHES SINGLE SHAFT IN |
| Stator Input Voltage Rating in Volts | 90.0 NOMINAL |
| Maximum Total Null Voltage Output in Millivolts Per Volt | 40.00 |
| Shaft Thread Direction | RIGHT-HAND SINGLE SHAFT |
| Pilot Length | 0.4700 INCHES NOMINAL IN |
| Shaft Thread Series Designator | UNF SINGLE SHAFT |
| Test Data Document | 81349-MIL-S-2335 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.). |
| Material | ALUMINUM ALLOY BODY |
| Terminal Type and Quantity | 5 SCREW |
| Second Shoulder Diameter | 2.1670 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| SK91499 | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| 212983 | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| MILS2335TYPE5CTBM0D1 | 4/1 Identification reference U.S. Government activity |
NSN 5990-00-644-0129 is a Synchro,control Transformer, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 5990, Synchros and Resolvers. Status: active.
NSN 5990-00-644-0129 has 2 manufacturer part numbers on file: SK91499 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), 212983 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for SK91499: Body Size: 34; Shaft Type: ROUND, SLOTTED SINGLE SHAFT; Body Diameter: 2.8100 INCHES NOMINAL IN; Flange Diameter: 3.5000 INCHES NOMINAL IN. 29 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.